Question

我有一个Gridview，允许用户编辑和删除记录。我正在使用.net 3.5使用C＃。

当我只有一条记录时，我的编辑命令工作正常，但当我的gridview中有超过1条记录时出现问题。

在这种情况下，当绑定控件时，它无法第二次找到控件，从而引发错误。

这是我的代码：

protected void gdScheduleNew_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if (ViewState["Updating"].Equals(true))
        {
            TextBox txtactsta = (TextBox)e.Row.FindControl("txtactualstartDate");
            TextBox txtactend = (TextBox)e.Row.FindControl("txtactualendDate");
            LinkButton lnkUpdate = (LinkButton)e.Row.FindControl("lnkUpdate");
            txtactsta.Attributes.Add("ReadOnly", "true");
            txtactend.Attributes.Add("ReadOnly", "true");
        }
    }
}

标记代码是：

<asp:GridView ID="gdScheduleNew" runat="server" Width="100%" SelectedIndex="0"
                        CellPadding="4" AutoGenerateColumns="False" ForeColor="#333333" Height="100px"
                        OnRowDataBound="gdScheduleNew_RowDataBound" onrowediting="gdSchedule_RowEditing">
    <FooterStyle Font-Bold="True" ForeColor="White" />
    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
    <Columns>
        <asp:TemplateField HeaderText="Planned Efforts">
        <ItemTemplate>
        <asp:Label ID="lblscheduleid" runat="server" Text='<%# Bind("scheduleid") %>' 
                                                    Visible="false"></asp:Label>
        <asp:Label ID="lblPlannedEffort" runat="server" Text='<%# Bind("sepcet") %>'></asp:Label>
        </ItemTemplate>
        <EditItemTemplate>
        <asp:Label ID="lblscheduleid" runat="server" Text='<%# Bind("scheduleid") %>' 
        Visible="false"></asp:Label>
                <asp:TextBox ID="txtsepcet" runat="server" Text='<%# Bind("sepcet") %>' 
                    Width="88px"></asp:TextBox>
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="ftxtsepcet" runat="server" Width="88px"></asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Actual Efforts">
            <ItemTemplate>
                <asp:Label ID="lblActualEffort" runat="server" 
                    Text='<%# Bind("actualeffort") %>'></asp:Label>
            </ItemTemplate>
                <EditItemTemplate>
                <asp:TextBox ID="txtactualeffort" runat="server" 
                        Text='<%# Bind("actualeffort") %>' Width="88px"></asp:TextBox>
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="ftxtactualeffort" runat="server" Width="88px"></asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Planned Start Date">
            <ItemTemplate>
                <asp:Label ID="lblPlannedStart" runat="server" 
                    Text='<%# Bind("plannedstartDate") %>'></asp:Label>
            </ItemTemplate>
                <EditItemTemplate>
                <asp:TextBox ID="txtplannedstartDate" runat="server" 
                        Text='<%# Bind("plannedstartDate") %>' class="dateclass" Width="88px"></asp:TextBox>
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="ftxtplannedstartDate" runat="server" class="dateclass" 
                    Width="88px"></asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Planned End Date">
            <ItemTemplate>
                <asp:Label ID="lblPlannedEnd0" runat="server" 
                    Text='<%# Bind("plannedendDate") %>'></asp:Label>
            </ItemTemplate>
                <EditItemTemplate>
                <asp:TextBox ID="txtplannedendDate" runat="server" 
                        Text='<%# Bind("plannedendDate") %>' class="dateclass" Width="88px"></asp:TextBox>
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="ftxtplannedendDate" runat="server" class="dateclass" 
                    Width="88px"></asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Actual Start Date">
            <ItemTemplate>
                <asp:Label ID="lblActualStart" runat="server" 
                    Text='<%# Bind("actualstartDate") %>'></asp:Label>
            </ItemTemplate>
                <EditItemTemplate>
                <asp:TextBox ID="txtactualstartDate" runat="server" 
                        Text='<%# Bind("actualstartDate") %>' class="dateclass" Width="88px"></asp:TextBox>
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="ftxtactualstartDate" runat="server" class="dateclass" 
                    Width="88px"></asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Actual End Date">
            <ItemTemplate>
                <asp:Label ID="lblActualEnd" runat="server" 
                    Text='<%# Bind("actualendDate") %>'></asp:Label>
            </ItemTemplate>
                <EditItemTemplate>
                <asp:TextBox ID="txtactualendDate" runat="server" 
                        Text='<%# Bind("actualendDate") %>' class="dateclass" Width="88px"></asp:TextBox>
            </EditItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="ftxtactualendDate" runat="server" class="dateclass" 
                    Width="88px"></asp:TextBox>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Member Name">
            <ItemTemplate>
                <asp:Label ID="lblMember" runat="server" Text='<%# Bind("membername") %>'></asp:Label>
            </ItemTemplate>
                <EditItemTemplate>
                    <asp:DropDownList ID="ddlmem" runat="server" DataTextField="MemberName" DataValueField="MemberID">
                    </asp:DropDownList>
            </EditItemTemplate>
            <FooterTemplate>
                    <asp:DropDownList ID="fddlmem" runat="server" DataTextField="MemberName" DataValueField="MemberID">
                    </asp:DropDownList>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Status">
            <ItemTemplate>
                <asp:Label ID="lblStatus" runat="server" Text='<%# Bind("status") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Edit" ShowHeader="False"> 
        <EditItemTemplate> 
            <asp:LinkButton ID="lnkUpdate" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton> 
            <br />
            <asp:LinkButton ID="LnkCancel" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"></asp:LinkButton> 
        </EditItemTemplate>     
        <FooterTemplate> 
            <asp:LinkButton ID="lnkAddnew" runat="server" CausesValidation="true" 
                CommandName="AddNew" Text="Submit"></asp:LinkButton> 
        </FooterTemplate> 
        <ItemTemplate> 
                <asp:LinkButton ID="lnkEdit" runat="server" CausesValidation="False" 
                    CommandName="Edit" Text="Edit"></asp:LinkButton> 
        </ItemTemplate> 
        </asp:TemplateField> 
    </Columns>
</asp:GridView>

错误在这一行：txtactsta.Attributes.Add("ReadOnly", "true");：

对象引用没有设置为对象的实例

我该如何解决这个问题？

Answer 1

在gridview中每个行都不会调用gdScheduleNew_RowDataBound吗？ txtactualstartDate和txtactualendDate仅存在于编辑行上，在非编辑行中不存在。

试试这个：

if (e.Row.RowType == DataControlRowType.DataRow && e.Row.RowState == DataControlRowState.Edit)

Gridview编辑模式用于多行

1 个答案: